Hoisting device for electric-arc lamps.



EATENTEE EUG. 1s, 1907.

J. NEU. l EoIsTING. DEVICE EOE ELECTRIC AEG LAMES.'

APPLIUATION EILED Novfs, 190e.

` @Eff/M vIUSTIN NEU, OF NUREMBERG, GERMANY, ASSIGNOR TO ELECKTR-BOGENLAMPEN-l APPARATE-FABRIK GES. M.

BESCHR. HAFTUNG.

HOISTIN G DEVICE FOR ELECTRIC-ARC LAMPS.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application led November 9, 1906. Serial No. 342,671.

-To all whom it 'may concern:

Be it known that I, JUSTIN NEU, of Nuremberg, a subject oi the King of Bavaria, and whose post-oiiice address is No. Il Knigstorgraben, Nuremberg, Bavaria, German Empire, have invented a new and useful Improved Hoisting Device for Electric-Arc Lamps, oi which the following is a specification.

The present invention relates to a hoisting device for electric arc lamps and has for its object a hoisting,` apparatus by means ot' which an arc lamp can be raised and lowered and automatically switched into and cut out of the electric circuit by means of a pull-cord, strap, band, rope, chain, wire or equivalent exible draft-means or pulling device which is connected with the hoisting device only during the time during which the lamp is belng raised or lowered, whereas the hoisting device itseli` is permanently provided with only a short pull-cord, strap, band, rope, chain, wire or the like equivalent iiexible pulling-device or draft-means, from which the lamp is suspended.

A further object of the present invention is to provide means for holding up the lamp while it is being raised or lowered, said means in any case holding or locking the lamp securely ii the cord, band or the like is released.

In order that the details of construction and action of the invention may be' clearly understood, reference is made to the accompanying drawing in which one form of the hoistingr device is shown by way of example, and in which:

Figme lis a side elevation ofthe device, the case being shown in section; Eig. 2 shows an end elevation Oi the device with the case in section on the line 2-2 in Fig. l; and Fig. 3 shows a detail end elevation oi the upper part of the means for hooking the detachable band into the short band on the hoisting apparatus.

Similar letters of reference refer to similar parts in all views.

A head-plate n forming part of the frame of the device and which may be fastened in any suitable manner to the ceiling or other suitable support carries the arms p, p in which a pulley or drum a is mounted revolubly and also a second guide pulley f. A lever b which has a wedge-shaped head c at the one end and a revoluble pulley o at the other end is mounted revolubly above the pulley a. A short band 7i which is iastened by means oi an angle iron o to a plate e on the body of the lamp runs over the pulleys f, a, and c. A yoke or bridge d or like abutment is attached to the arms p in such a manner that the wedge-shaped head c o the lever b jams between the bridge part of the yoke d and the periphery of the pulley a over which the band h runs, when said lever b is in the position shown in full lines in Fig. l. A spring g tends to hold the lever b constantly in the position indicated in full lines.

The plate e of the body of the lamp is provided with electric Contact pillars m, m] which slide into corresponding electric Contact sleeves l, Z1 the latter being fastened to the head-plate 1L of the hoisting device. A case r incloses the device, openings being provided in the same through which the band h, the pulley o and the Contact pillars m, m1 pass as represented in the figure. The lamp is switched into or cut out oi the electric circuit respectively, according as the Contact pillars m, ml are at their highest position in the sleeves Z, Z1, or as they body oi the lamp with the plate e and the contact pillars are lowered.

The short strap or band h is provided at its free end with a hook t' or the like into which the eye t of a long strap or band s can be hooked. When this band is hooked on to the hook t' and pulled downwards, the

.pulley c is pressed downwards, and when the band s is somewhat slackened again the plate e with the body of the lamp is lowered, the short band hand its continuation, t'. e. the long band s running over the pulley a. At the very moment at which the band is let go, the pulley c is relieved of pressure and the spring g pulls the wedge-shaped head k of the lever b dot wards between the periphery of the pulley a and the bridge of the yoke d whereby the band is clamped and the lamp is prevented from descending. The long band s may be hooked into the hooks t' by using a rod w which is carried by the attendant and which is iitted with a double leaf-spring o at its head, between the leaves of which the upper end of the band t is clamped. The hoisting device in accordance with the present invention has besides others also the advantage that one single long band can be used which the attendant carries about with him for use with all the arc lamps oi a plant or oi a room, whereas the hoisting device itself has only the short band h. In the embodiment illustrated by way oi example a iiat strap or band is provided; but of course a rope, cord or chain may be employed instead; in the latter case the pulley a will be formed in known manner as a chain-pulley, and the head 1c of the lever b will be correspondingly provided with teeth to engage the links of the chain. In like manner the short band h or the chain may, of course, have an eye and the long band s or chain may be provided with a hook, and similar constructional variations may be devised without departing from the spirit and scope of the present invention.

What I claim, and desire to secure by Letters Patent of the United States, is

1. A hoisting device for electric lamps, comprising in combination a frame, a short flexible pulling device, means connecting' the same with the lamp, a pulley en the hoisting device for guidingsaid pulling` device, a long portable flexible pulling device, means for detachably connecting said lont,Y portable pullingl device with the short pulling device whereby the former while in use forms a detachable continuation et' the latter, a spring-actuated pivoted lever provided with an arm havingl a clamping; head. a pulley revolubly mounted on said lever over which pulley the i11- terconnecled pulling devices run, and an abutment provided on the frame in proximity to the edge of the pulley Iirst mentioned above. said clamping head beingl normally between said abutment and pulleyedge under the springaction whereby whenever the interconnected pulling devices are let go said bead takes up its normal position and locks the lamp in its position occupied at the time, said head beine' disengaged from the pulley while the pulley pulling; devices are beim;4 operated.

2. A hoistiirdevice oL` the type described ior elec` lamps. comprising;` in combination a frame, a short strap provided with a hook at one end. means connectinf,r the other end ot said strap with the lamp, a pulley for guiding.;l d strap, a 1011;;l portable strap provided with an eye e11- gaggingr said hooi; on tho strap so that the long strap while in use forms a detachable continuation oi' the short strap, a pivoted lever, a spring actin;4 on said lever, said lever beinf;y provided with an arm having; a wedgelshaped head, a

pulley revolubly mounted on said lever, over which pulley the interconnected pulling' devices run. a yoke in proximity to the edge of the pulley` said clamping head being; normally between said yoke and pulley under the action oi' the spring whereby whenever the pulling-devices are let go said head takes up its normal position and locks the lamp in iis position occupied at the time, said head being disengaged from the pulley while the pulling-devices are bein;l operated.

3. A hoisting device 01' the type described for electric lamps. comprisingin combination a irame havingl a headplate, provided with contact sleeves, and two arms, two pulleys mounted on the latter, a short strap passing, over said pulleys and provided with a hook at one end, means connecting; the other end oi said strap with the lamp, a lonsY portable strap provided with an eye engaging said nook on the strap so that the long.; strap while in use forms a detachable continuation ot' the short strap, a pivoted lever, a spring.;l acting on said lever, said lever being pro vided with an arm having a wedgershaped head, a pulley revolubly mounted on said lever, over which pulley the interconnected pulling devices run, a yoke in proximity to the edge o1' the pulley, said clamping head being, normally between said yoke and pulley under the action of the spring whereby whenever the pulling-devices are let go said head takes up its normal position and locks the lamp in its position occupied at the time. said head being disenA gagged from the pulley while the pulling-devices are being operated.

In testimony whereof I have hereunto set my hand in presence ol' two subscribingl witnesses.

JUSTIN NEU.

Witnesses RICHARD lnlnFriuU,

Hoiissnna DOCHLEMANN. 

